I just created a new forum from an old one which was not in use, so I changed the website name and made a lot of changes, the one I could not do, is to upload a new photo for the main logo: a panel says: there is maintenance, try again a few minits later, but I have been waiting all day and nothing happens.

What can be the problem? It is possible that thhis maintenance is happening all day and maybe more?

Yes, just in the Admin section. I use this a lot for changing the board for someone's birthday. Wanted to do that today for a member and you just get the "down for maintenance message"... I sure wish someone would fix this soon.